Friction draft rigging



May 6, 1924. 1,493,193

G.B.DOREY FRICTION DRAFT RIGGING filed March 13, 1922 2 sheets-sheer I1 /3 5d 5% /g l 8 W/TNESSES ,RJK; S i A NVENTOR May 6, 1924. 1,493,193

G. B. DOREY FRICTION DRAFT RIGGrING Filed March 15, 1922 2 Sheets-Sheet 2 w/TNEssES IN VEN TOR Patented May 6, 1924.

UNITED STATES PATENT OFFICE.

GEORGE BINET DOREY, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR vT WILLIAM H.

MINER, OF CHAZY, NEW YORK.

FRICTION DRAFT RIGGING'.

Application tiled March 13, 1922. Serial No. 543,430.

To all whom it may concern:

Be it known that I, GEORGE BINET Donny, a subiect of the King of Great Britain, yand residing in the city of Montreal, Province of Quebec, Dominion of Canada, have invented certain new and useful Improvements in Friction Draft Rigging, and do hereby declare the following to be a full,

clear, and exact description of the same.

My invention relates friction draft riggin-gs cars and the like and is to improvements in as used in railway especially related to said frictional member and move relatively thereto and to provide suitable wedging means to ensure frictional contact.

It is also an object of the invention to provide pressure transmitting members having a short travel and adapt t'he same to displace other friction elements a correspondingly greater distance and at speed. A

produce a friction a relatively greater further object of my invention is to draft rigging which will ive a variable resistance, providing for a light resistance at the commencement of the compression movement increasing capacity as ment increases.

A further object of and a differentially the range of movethe invention is to provide a'structure wherein the central frictional element will be .rela-tively stationary to thecasing and not subjected to transverse displacement or bending stresses.

Further my invention consists in certain other features of novelty such as will be more particularly pointed out in this lspecification and claims.

For a fuller comprehension of my invention reference must be had to the accompanying drawings wherein like references indicate like parts and wherein:

Figure l is a horizontal sectional View.

through the, complete r igging as assembled and applied between the sills of a railway car, the parts being in the normal or extended position.

Figure 2 is a sectiona 2-2 of Fig. 1.l

l view taken on line Figure 3 is a horizontal sectional view 55 as shown in Fig. 1, showing the lrigging under full compression.

Figure 4 is a longitudinal side view of the rigging taken on line 4--4 of Fig.v 1, showing the rigging bolted together as a self-con-` tained unit.

Figure 5 is a perspective view of the casing showing a portion thereof in section.

Figure 6 is a perspective view of the central friction member.

Figure 7 is a perspective view of one of the friction shoes.

Figure 8 is a perspective view of one of the wedge' block pressure transmitting members. l

Figure 9 is a perspective View of the wedge retaining member. f

In thev dra-wings '2 represents the drawbar of the coupler connected by means of key 3 to the yoke 4 in the usual manner, the yoke 75 embracing the casing 5 and the whole being located between the center sills 6-6. The rear of the casing' 5 is formed to abut against rear stops 7-7 which are secured to the center sills by meansof rivets 8, front stops 9-9 also secured to the center sillsin like manner constitute draft gear abutments under pulling strains.

The draft rigging as illustrated in the drawings consists of the. casing 5, central friction member 10, frictionshoes 11, wedge retaining member 12, wedge block pressure transmitting members 13, follower 14, outer spring 15 and inner spring 16. The central friction member is secured yagainst outward movement by means of bolt 17 and nut 18, the central friction member being recessed at 10a to accommodate the nut.

The casing 5 is preferablyv formed of rectangular section with one end closed and the other end open4 and formed at each side near the open end with two sets of (ro-extending friction surfaces as shown at 5 and 5b. Surfaces 5 being parallel to the longitudinal line of draft and surfaces 5"being inclined 10o thereto. butments 5C are disposed in each corner of the casing and constitute bearings for the ends of the beams 10b of the central friction member 10. These beams extend from one side. of the casing to the other and are substantially parallel with the lateral walls of the casing and act as supports for the erossbeam 10 which dividesthe casing.

The crossbeam 10c is provided with a depending portion extendmg inwardly into the casing which is formed on either side thereof with bearing surfaces 1()d preferably made fiat and adapted to co-act with 'the interior surfaceslla of the friction shoes 11. The friction shoes 11 are adapted to have reciprocatory motion on the friction member 10 andl in order to insure frictional engagement between these members the former are formed with wedge shaped surfaces as at 11b adapted to co-act with similarly inclined surfaces l12a 'of the wedge retaining member l2.

The wedge retainingl member is forced tightly over the inclined portion of the shoes by the tension in the outer spring 15 which abutting on surface 12" thereby resists inward movement of the shoes. The exteriorv of the shoesat the inner end as at 11c are preferably curved and project beyond the surface 12bof the wedge retaining member thereby forming a medium for centering the outer spring and securing the same against lateral displacement. The end of the shoes as at 11d are preferably made flat and form a bearing forlnner lspring 16- which'directly opposes inward movement ofy the shoes and also operates to break the engagement between the wedge retaining member and the shoes thereby facilitating the releasing of the rigging.

The outer ends of the shoes are also formed with exterior wedge shaped surfaces as at 11 and these surfaces are adapted to register with similarly formed surfaces 13` of the wedge pressure transmitting members 13. Pressure applied on the wedge blocks in a longitudinal direction is resolved in part into a transversely acting force against the casing walls due to the inclination of the walls 11 of the shoes. During the early stages of the compressive action of the rigging, walls 13b of the wedge blocks co-act with walls 5a of the casing but at 'a later stage in the gears compression movement inclined walls 13 move into engagement lwith walls 5" of the casingv thereby communicating to the wedge block pres- `sure transmitting members a transverse as well as a longitudinal motion. rlhis transverse motion results in frictional action between faces 13 of the wedge blocks and inner surface 14 of the follower 14 inasmuch as these surfaces are preferably at right angles to the line of draft.

When the gears are assembled both the inner and outer springs are placed under initial compression, the friction member 10 having a hole 1()e extending throughout its length for the reception of bolt 17 and by means of which the friction member is secured to the rear of the casing. The abutting faces 10t beams 10 are adapted to engage the lugs of the laterally extendingv aeeaiee draft rigging is i compressed. by the tip-.

proach of follower to casing,A the rearof the casing abutting against rear stops. This movement causes wedge 'block' pressure transmitting members 13 yto be -moved longitudinally into the casing '55. During such movement the walls 13b of members 13 co-act with parallel walls 5a of the casing forcing the former outwardly against the casing wall by reason of the inclined exterior walls 11e of the shoes co-acting with interior wedge shaped surfaces 13a of members 13, and consequentlyl the pressure transmitting portion of the rigging as composed of the follower and wedge block pressure transmitting members move longitudinally into the casing in unison ywith the loady resisting portion of the rigging `as composed of the shoes and wedge retaining member. The transverse reaction ofthe members 13 against the casing walls results in the slices bei-ng forced against the'central friction member 1() and this transverse force is further augmented by the pressure of the outer spring acting on the Wedge retaining member in the manner already explained. f

Continued inward movement of members 13 results in wedge surfaces 13@ which eX- tend longitudinally of the gear and are disposed side by side for a portion of their length withy surface 13b but inclined thereto making contact with inclined walls 5* of the casing thereby causing the members 13 to move transversely towards each other as well as in a longitudinal direction. As these members move transversely towards each other it will be seen that the interior wedge. faces '13 will be brought closer to each other thereby creating `a squeezing effect on faces 11's of the friction shoes callsing these members together with the wedge retaining member to move a greater distance than the wedge block pressurev transmitting members and therefore'at agreater speed. Inasmuch as the wedge block pressure transmitting members' move longitudinally into the casing at "d'rawbar speed it follows that the load resisting members will move a greater distance and therefore at a greater speed than the drawbar. The transition from low to high resistance is thus accomplished without altering the Upon the maximum compression of the gear being attained the surface 14 of the follower 1.4 is adapted to abut on the casing edge at 5, this latter member taking the solid blow and thereby relieving the friction mechanism of undue strain.

Both the inner and outer springs being compressed and the gear solid, release takes place as follows The springs reassert themselves returning the friction shoes with the wedge retaining member in a. forward direction forcing the wedge block pressure transmitting members in an outward and forward direction and returning therewith the follower and drawbar to the normal release position.

Any tendency of the shoes binding onl the central friction member is prevented by the innerl spring which bearing directly on the ends of these members forces them slightly out of engagement with the wedge retaining member thereby loosening the frictional adherence between the parts.

From the preceding description it will be noted that the central friction element being supported near thel open end of the casing is free from bending strains and is subjected only to shearing and tensional strains during the compressive action of the rigging. The use of a friction member mounted in the casing in the manner described permits the production of an unusually compact rigging and one wherein all the parts are secured against displacement. rlhe lateral beams extending from side to side of the casing centralize the friction member and the depending portion of the same extending inwardly serves to centralize the inner spring within which it is extended.

While I have shown and described one particular embodiment of my invention it 1s fia evident that certain changes and modifications may be made without departing from the spirit and scope of the claims.

lVhat I claim is:

1, In a friction draft rigging a wedging element having a plurality ofsurfaces disposed at varying angles and adapted to come into action successively, the said surfaces eX- tending side by side longitudinally of the gear for a portion of their length. i

2. In a friction draft rigging the comblnation -of movable elements and relatively stationary elements each having a'plnrality of friction faces, the said faces being disposed at different angles with the line of draft and extending side by side longitudinally of the gear for a portion of their length.

3. A friction draft rigging comprising a relatively stationary member, a drawbar movable relatively thereto, pressure transmitting members insliding engagement with the stationary member and movable in unison with the drawbar, resistance members in engagement with the said pressure transmitting members and adapted to be displaced thereby a greater distance than the drawhar moves and means whereby the speed of the resist-ance members is increased during such movement at a predetermined point.

4. A friction draft rigging com rising'a casing, pressure transmitting mem ers, one side of each member being formed with a single face andl an adjacent side being formed' of a plurality of faces disposed at var 1ing angles and adapted to engage tbe casing successively.

5, A friction draft rigging comprising a casing, a beam dividing the same and friction shoes engaging the said beam, transversely and longitudinally movable pressure transmitting members acting on the shoes to displace the same.

6. A friction draftrigging comprising a casing having beveled walls, wedge pressure transmitting members in engagement therewith, a beam extending across the casing and having a depending portion extending inwardly therein, friction shoes having interior faces in engagement with the said beam, the shoes having their ends formed with oppositely disposed wedge shaped outer faces; one end of each shoe having engagement with thewedge pressure transmitting members and the other end being engaged by a wedge retaining member and springs opposing inward movement of the parts. y

7. A friction draft rigging comprising a casing having beveled walls, wedge pressure transmitting members having adjacent inclined surfaces, one of such surfaces engaging the beveled walls of the casing and the other of such surfaces engaging movable shoes, the said shoes being in sliding engagement with a central friction member extending from side to side of the casing and supported thereby. i

8. In a friction draft rigging the combination with a movable drawbar of a casing provided with abutments and a beam supported thereon, friction shoes in engagement therewith and means in engagement with the casing for moving the shoes a greater distance than the drawbar moves.

9. A friction draft rigging including a 'asing having one end open` side walls and an end wall, transversely and longitudinally movable pressure transmitting members having engagement with the side walls. a friction melnber carried by the side walls and spaced from the end wall, friction shoes engaging the said friction member and adapted to be moved by movement of the pressure transmitting members.

10. A friction draft rigging including a casing having oneend open, side walls and an end wall. the side walls being provided with beveled faces at the open end and Wedge bloc-ks sliding thereon, a friction member .carried by the casing and spaced from the end Wall, friction shoes engaging the said t'riction member and adapted to be displaced by movement of the Wedge blocks.

11. A friction draft rigging comprising a easing, abutments within the casing, a beam supported thereby, friction shoes in engagement with the said member, transversely and longitudinally movable pressure transmitting members in engagement with the said casing and adapted to move the friction shoes and means for securing the said beam against outward movement.

12. A friction draft rigging having a easing presenting an end Wall and having the opposite end thereto open, beveled walls at its open end. pressure transmitting members having sliding engagement on the said beveled walls, friction shoes having their opposite ends formed Wedge shaped, the said shoesl having engagement With the pressure transmitting members at their outer ends and having engagement with a Wedge retaining member at their inner ends. the said shoes being adapted to have sliding engagement with a member supported by the casing Walls` spring means interposed between the friction shoes and the end wall and spring means interposed between the Wedge retaining member and the end wall.

13. Afr-iction draft rigging having a casing presenting substantially parallel side Walls, pressure transmitting members having engagement 'with the lsaid Walls, a friction member disposed Wit-hin the casing and friction shoes in sliding engagement therewith, the said shoes being each formed with inner and outer wedge shaped ends and an integral Wedge retaining member adapted to act. upon the inner ends of the shoes to force the same into engagement with the friction member and the outer ends of the shoes being acted upon by the pressure transmitting members and springs tor maintaining the parts in operative relation.

14. Ain a friction draft rigging for railway cars. the combination oi a stationary member and pressure transmitting members in sliding engagement therewith and movable uniformly in a longitudinal direction, load resisting members adapted to be displaced by the pressure transmitting members variably in a longitudinal direction, such variation being efteeted by transverse movement of the pressure transmitting members.

ln witness whereof l hereunto aHix in v signature in the presence of two witnesses.

GEORGE BINET DOR-EY. iVitnesses:

W. A. PITT, R. R. GoanoN. 

